Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfdf289e6759dc04…

MALICIOUS

PDF

102.1 KB Created: 2021-10-13 08:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 502c00a1964ee98d9e9b44d1a4d99c57 SHA-1: 4946d05eeae7d13909e9ae19b956fa5cc0e72f99 SHA-256: dfdf289e6759dc049775c98efad8c92e9576e15dc21d82923c7d71925d287f0d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with many pointing to suspicious domains, and one heuristic specifically identifies it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://zbraneklapka.cz/ckfinder/userfiles/files/pasunanofuvamuxaj.pdf In PDF document text
    • http://zhuxintrading.com/uploads/ckfinder/files/20210901/16304577264835.pdfIn PDF document text
    • http://yieldpharm.com/upload/files/paruvaxurotituveluraki.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/95483141090.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/jewutazijukenowuxowebaron.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/fisojapodafa.pdfIn PDF document text
    • https://osakadentalcare.com/contents/files/30593143627.pdfIn PDF document text
    • https://ikra-ekb.ru/files/fckeditor/file/In PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/kugewot.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/20289151021.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/rosudefajo.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161456cd1f22ef---dofopasabivupixamuzoji.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/91464485533.pdfIn PDF document text
    • http://gro-felix.si/uploads/gekubonigaluvuzidetijolam.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/jejaduxupuvituderejebetir.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210907084753.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210920190335.pdfIn PDF document text
    • http://aurora-c.jp/files/files/1914757842.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/35637842813.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/motoduvonikasoromuriv.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/85822fc3e502b98195e26c2cb4dbdcf6/visowuwomidofitepi.pdfIn PDF document text
    • https://comfort8889.com/upload/files/31895226117.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/49690827261.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/26882604855.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/896FEnmJZlk/uplcv?utm_term=patriarch+of+constantinople+definitionPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12040 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13857 10716 bytes
SHA-256: c6cf9cc8bd24b268e8d25062c1cb4b253808af3c2e3589fa90d4fb97c931057d
font_02_sfnt_off000150df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150DF 22312 bytes
SHA-256: acb9b9ceb34ca7cfa8d2ab6927e928a7a79a588190fd8465302caa1f4188f243

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